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Chapter 17

Across
Tectonic process associated with convection currents in Earth's mantle that occurs when the weight of the subducting plate pulls the trailing lithosphere into a subduction zone
Long, narrow depression that forms when continental crust begins to separate at a divergent boundary
Huge pieces of Earth's crust that cover its surface and fit together at their edges
Process by which one tectonic plate slips beneath another tectonic plate
Device used to map the ocean floor that detects small changes in magnetic fields
Study of Earth's magnetic record using data gathered from iron-bearing minerals in rocks that have recorded the orientation of Earth's magnetic field at the time of their formation
Place where two tectonic plates are moving toward each other; is associated with trenches, island arcs, and folded mountains
Ancient landmass made up of all the continents that began to break apart about 200 mya
Place where two tectonic plates are moving apart; is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the seafloor
Tectonic process associated with convection currents in Earth's mantle that occurs when the weight of an elevated ridge pushes an oceanic plate toward a subduction zone
Wegener's hypothesis that Earth's continents were joined as a single land mass, called Pangaea, that broke apart about 200 mya and slowly moved to their present posisitons
Down
Imaginary line on a map that shows points of the same age; formed at the same time
When Earth's magnetic field changes polarity between normal and reversed
Place where two tectonic plates slide horizontally past each other; is characterized by long faults and shallow earthquakes
The hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea tranches; occurs in a continuous cycle of magma intrusion and spreading